Optimization of air-dropped water for aerial firefighting against urban fire by actively controlled wind tunnel

在发生大地震灾害时，由于道路破坏、消火栓损坏等原因造成的消防供水不足，导致大面积城市火灾扩大。如果飞机，如直升机，可以在特定条件下使用，它将是有效的消防。飞机可以在短时间内到达火场，灭火工作可以快速进行。因此，在发生重大灾难的情况下，由灭火直升机对城市火灾进行空中灭火将是意料之中的。然而，关于空中灭火的灭火或威慑作用，目前还没有针对城市火灾的足够的研究工作。到目前为止，真实直升机使用的真实尺度实验是由国家火灾与灾害研究所进行的。要频繁地进行真实规模的实验是很困难的。因此，在本研究中，提出了小型模型实验，并验证了其与真实尺度实验的相似性。研究结果表明，从水桶中滴水的空气传播现象是可重现的。此外，还获得了有效的空中灭火方法的一些信息。

In case of a great earthquake disaster, wide area urban fire would be expanded for lack of firefighting water supply from road destruction, hydrant damage and so on. If airplanes, such as a helicopter, can be used under specific conditions, it would be effective for firefighting. Airplanes can arrive at the fire site in a short time, and fire fighting can be carried out quickly. For this reason, it would be expected for aerial fire fighting by a fire-fighting helicopter for urban fire in case of a great disaster. However, about the fire extinguish or deterrent effect by aerial firefighting, there is no enough research work for urban fire. Until now, the real scale experiment used by real helicopter was carried out by National Research Institute of fire and disaster. It is difficult to carry out the real scale experiment frequently. Therefore, in this research, small model experiment was proposed and similarity with a real scale experiment was verified. As a result of this research, it was reproducible about the air spread phenomenon which was dropped water from the bucket. Furthermore, some information of the method of an effective aerial firefighting was obtained.